In service, a rotating steel shaft is subjected to an alternating stress of +/-

Question

In service, a rotating steel shaft is subjected to an alternating stress of +/- 350 MPa. Which of the following would increase the fatigue lifetime of the component? (Choose all that apply.) 1) Apply a surface treatment (e.g. carburization) that places the outer surface of the shaft in compression. 2) Increase the rotational frequency (RPM) of the shaft. 3) Apply an additional tensile stress along the axis of the shaft. 4) Increase the diameter of the shaft. 5) Replace the steel with an aluminum alloy.

Explanation / Answer

. 2) Increase the rotational frequency (RPM) of the shaft.

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